Multiple passage hose



NOV. 8, 1938. M. BERMAN ET AL 2,136,230

MULTIPLE PSSAGE HOSE Filed Nov. 27, 1936 J@. 2. Eg4

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Patented Nov. 8, 1938 OFFICE MULTIPLE PASSAGE HOSE Michael Berman and William Brockner, Buflalo, N. Y., asslgnors to Bewitt Bubber Corporation,

' Application November 27, 1936, Serial No.112,852

' 2 ,Clahm. -(Cl. 138-49) This invention relates to improVements in multiple passage hose. This application is in part acontinuation of'our pending applicationSeriai No. 73,457 filed April 9, 1936, now Patent 2,122,335 01 June 28, 1938.

. In many instances, it is desirable to deliver two or more fluids from diflferent sources to a common delivery point, as for example in the case of oxygen and acetylene gases, hdrogen '10 and oxygen gases, or other gases which may be used l'or welding or heating, and which are conducted from separate tanks through -hse to the point at which combustion takes place. Similarly in fire extinguishing, dilute sulphuric acid and sodium carbonate solutions may 'be conducted from separate sources through sparate'hose to a common discharge point. Under such conditions. it is desixable to have two or more parallel Iengths oi' hose joined into a singie hose with separate passages for the diflerent fluids. In connection with most of these uses, it is also essentiel that the hose be of a strong and rugged construction, such for example as a tabric reinforced hose.

One of the objects of this invention is to provide a multiple passage hose provided with a fabric reiniorcement and having a single place 01. outer covering commun to both passages of said hose. Another object is to provide a hose of this kind in which a plurality of lengths of hose are arranged side by side and joined along an ede so that the outer rubber covers et the seVerai hose are integraily connected and so that the inner portions of the hose will be centrally located with reference to the oter covering. Another object is to provide a hose in which a layer oi ruhber cement is provided toiorm aconnectlon between the inner 'tubing and the fabric of the hose. Other objects of the invention will appear from the following description and claims.

In.the accompanying drawins: Fig. 1 is a transverse section of a hose enibodying this invention. Fig. 2 is a transverse section of the inner tube thereof. V Fig. 3 is aJragmentary elevation, partly in section, howing an inner tube with the cement and 1abric applied thereto. Fig. 4 is a transverse section thereoi. on line 44, Fig. 3.

Fig. 5 is a iragmentary transverse section, on; an enlarged scale. of the hose tubing, fabric and cementshowninFigs.8and4.'

Fig. 6 is a, fragmentary transverse s'ectionbi ..the flnished hose.

Fig. 7 is a fra2meniary transverse section 'of a mold in which the hose is vuicanized. 4

Fig. 8 is a fragmentary perspective view of an 5 end portion of the multiple passage hose embodying this invention.

Our finproved reinforced multiple passage hose includes two or more. inner tubes il! arranged side by side in spaced relation to each other. -l0 Each length of tubing lo may. if desired, be covered on its exterior surfacewith a layer of rubber cement H and a layer of iabric reinforcing i2 is applied, in any suitabie manner, either by wrapping the tubing with canvas or by braiding '15 a cord reiniorcement about the .tubing. [5 represents the outer layer or covering of the hose which is so i'ormed that the covering surround-' ing one or the inner tubes i0 is formed integrai with the covering 01 an adjacent inner tube in.

The inner tubing io may be produced in any usuai or suitablemanner, for example, by means of a suitable extruding machine. After this tubing has been extruded, for reasons heteinafter more iuily explained, the tubing may be semicured by heating in the usual mariner, for. ex-

. the reason that the relatively stifl' or semi-cured rubber tubing does not. during vuicanization under pressure, 1eadily flow into or t hrough the interstices of the fabric. Consequentiy, for this purpose we may, ii desired, apply around the 40 tubing il a thin layer of any of the suitable and well known rubber cements. This may be done by passing the tubing through a solution of the liquid rubber cement beiore the fabric reiniorcement is applied. Consequently, this cement 45 bonds ltself securely to the semi-vulcanized tubing lil and also .penetrates through the fabric i! which la applied about the tubing l0. After the fabrlc has been applied, the tubing ispassed through un extruding machine and the outer 50 covering Il is xtruded about the fabric-reiniorced inner tubing il). 'Ihrough this extruding machine. either a single length of iabric reinforced tubing il! ia passed, 'or ii-desired, the extiuding die may be iormed to receive two or more 55 lengths o! fabric reinforced tubing l0 arranged side by side and the outer covering l5 may be extruded as a single place extending around both of the adjacent iengths of fabric reinforced inner tubing.

The vulcanizing of the hose may be done in any suitable or desired manner. As shown in Fig. 7, a vulcanizing press is employed having a pair of mold plates 20 and 21 which are secured in heat conducting relation to steam platens 22 and 23, one of which is movable relatively to the other. The extruded hose is laid in lengths in the grooves or, cavities 24 of the platen press as shown in Fig. 7, while the mold plates are separated. It will be noted that the mold plates are provided with connected or communicating grooves or. cavities 24 for receiving the adjacent lengths of hose. If these lengths have been extruded separately and are entirely covered about their peripheries with the usual soapstone or talcum, the adjacent portions of the tube lengths of hose are cleaned in any suitable manner to remove the soapstone, so that the covering layers of the two adjacent lengths will adhre to each other and will aiter vulcanization become integrally connected. The movable platen is then moved toward the flxed platen so that the mold plates 20 and 2! are in contact, as shown in Fig. 8, so that the vulcanization of the hose can proceed. During this vulcanization, the adjacent lengths of hose are fllled With air or water under pressure. as is customary in vulcanizing single passage hose, except that when using semi-vulcanized or partly cured inner tubing, we increase the pressure in the tubing from to pounds par square inch. This internal pressure drives portions of the outer surface of the inner tube into the braid or fabric, and with the aid of the cernent, the inner tube becomes securely attached to the fabric. During the vulcanization, the heat wlll cure the outer coverlng IS 01 the hose and complete the curing of the inner tubes Il). The rubber cernent, which forms a. layer around ea0h inner tube l0, securely bonds the inner tubing to the fabric reinforcement and the outer covering l5.

In the manufacture of single passage hose, the grooves or resses in the mold plates orm continuous walls extending completely around the portions of the hose located within the mold plates, and no difliculty has been experlenced in maintaining the inner tubes in central relation to the hose, and consequently, it was not found necessary in connection with the manufacture of single passage hose to semi-vulcanize or other wise stiilen the inner tubing of such hose. In the manufacture of multiple passage hose, bowever, the recesses in the mold plates which re' ceive the hose do not extend around the entire periphery of each portion of the hose, and consequntly, because of the open or connecting portion between two adjacent grooves or recesses of the mold, the inner tubing is not conflned in central locations in the gro0ves or reCasses. Thi8 inner tubing. when containing air or water under pressure. tends to become deformed and to enter into the connecting portion of the recesses or grooves of the mold. 'Ihls deiormatlon weakens the hose for the reason that the outer coverlng l5 will be 0l. diiterent thiclcnesses at diflerent portions thereoi and the deformatlon of the inner tubing may also interiere with the free flow of fluids through the hose.

in order to overcome this dlfllculty and to maire it possible to produce multiple passage hose of strength equal to that of corresponding single passage hose, we have formed our multiple passage hose by first semi-vulcanizing the inner tubing l, which hardens the same so that it will not readily flow toward the opening or connection between two cavities in the mold plates or become deiormed. This semi-curing of the im..- ubing resulted in difliculty in forming a Droper bond between the inner tubing and the fabrlc reinorcement, since the semi-curing hardens the rubber of the inner tubing to such an extent that it will not flow into or through the interstices of the fabric. This diificulty, however, we have overcome by applying about the semi-cured inner tubing a layer or coating of liquid rubber cernent. Consequently, when our improved multiple passage tubing is cured in a vulcanialng press, the hardness of the semi-cured rubber of the inner tubing Il! prevents this tubing from becoming distorted out of circular cross section in the mold cavities when subjected to internal pressure, and the rubber oement forms a very secure bond between th inner tubing, the fabric reiniorcement, and the outer covering l5, so that the resulting multiple passage hose has the inner tubing l0 cf correct circular form and centrally located in the covering l5. Consequently, the multiple passage hose embodying our invention bas a strength or resistance to lntemal pressure equal to that of single passage tubing of similar size. The multiple passage hose has the further advantages that the tendency of the same to snarl and coil when used is very greatly reduced and the knotting of one length of hose about another is entirely prevented by iorming these two lengths into a single pieoe. When the hose has two passages and is formed of a figure 8 shape, it. also tends to lie fiat on a fluor or supporting surface and there is, consequently, less tendency of the hose to roll or twist.

Hose of the kind described has the advantage that its length is not limited by the length of the vulcanizing press, since the hose can be advanced through the press after each vulcanizing operation, so that a hose of any length can be vulcanized step by step.

In the flnlsbed hose, the ends of the hose may, if desired; be formed by having the outer cover separated at the ends to form short lengths of single passage hose, which can be readfly connected to the receiving or discharge devices With which the multiple passage hose cooperates. These single passage ends may be formed by simply slitting or cutting the multiple passage hose lengthwlse with a knife to the desired distance from an end of the hose, or, if the hose is formed connecting separately extruded single passage hose, by leavlng the soapstone between the end portions et the hose so that these end portions will not become vulcanized together.

II desired the separate or single passage ends 21 and 28 of the they are integrally connecd, be provided with a. band of any suitable form to preventiurther seprating 01 the two lengtbs oi hose and to prevent tearlng of the cover of the hose at the end of the out or separation. As illustrated in Fig. 8, this can easily be done by placlng about the hose hose may, at the point at which' a metal baud 2! which initially may be made of elliptical or other suitable form so as to pass easlly over the multiple passage hose and the portions ofthis band at the juncture of the adjacent lengths of hose are pressed inwardly by means of a suitable die or implement to form grooves or depressions 30 at opposite sides there- Whlle the hose shown ineludes only two lnner tubes or passages, it will .be understood that 11: IS not intended to limit this invention tu hose having two passages, slnce obviously thre or more lengths of tubing may be integrally connected by means of the outer coverlng as herein descrlbed.

We clai m as our invention:

1. A single-plece multiple passage hose comprising a plurallty of fabrlc reinforced rubber tubes arranged side b side and spaced apart, one of said tubes being provided for each passage of said hose, the fabric reintorcement oi each tube extending completely around th passage, and a. single outer cover of rubber for .said plurality et tubes, arranged to form a layer of substantially uniform thickness about each tube and securely bonded to each tube, said cover including an lntegral connecting part of substantial thickness forming a connection between adjacent lengths ofcovered tubes and which extends over materially less than one-iourth 01 the periphery of each of said connected covered tubes, all of sald parts of sald hose at any transverse section thereot being slmultaneously vulcanized together under pressure into a uniform, unitary and resllient body. 2. A single-piece multiple passage hose comprising a. plurality of fabric reinforced rubber tubes arranged slde by slde and spaced apatt, one 01 said tubes being provided for each passage et sacld hose, the fabric reinforcement of each tube extendlng completely around the passage, and a single outer cover of rubber l'or said plui-ality of tubes, arranged to form a layer of substantlally unitorm thicknes5 about each tube and securely,

bonded to each tube, said cover including an integral connecting part of substantial thickness forming a. connectlon between adjacent lengths of covered tubes and which extends over materially less than one-fourth of the periphery of.

. each of said connected covered tubes and forming longitudinal grooves between adjacent covered tubes, th cover at an end of said hose being formed about each tube independently of an adjacent tube wlthout said integml connectlng part, whereby the ends of the connected tubes are dis- 'connected from each other at an end of the hose, and a metal baud extendlng about said hose at the juncture of. said disconnected ends with the integnl connecting part, Said baud belng of an endless piece of metal, and having recessed portiens bent into sald longitudinal grooves to contract sald baud into tightly grippihg engagement with said hose.

, MICHAEL BERMAN.

WILLAM BROCKNER. 

